Revert of Remove the acclerated overflow scroll and fixed root background flags.

content/public/common/content_switches.h

Index: content/public/common/content_switches.h
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index 0926c6e75a94c2ff4034403fbc818fa1a4d4bd0c..cc87daa43c3294c21512dde29b55148bd6f82183 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -33,6 +33,8 @@
 CONTENT_EXPORT extern const char kDisable2dCanvasAntialiasing[];
 CONTENT_EXPORT extern const char kDisable3DAPIs[];
 CONTENT_EXPORT extern const char kDisableAccelerated2dCanvas[];
+CONTENT_EXPORT extern const char kDisableAcceleratedFixedRootBackground[];
+CONTENT_EXPORT extern const char kDisableAcceleratedOverflowScroll[];
 CONTENT_EXPORT extern const char kDisableLayerSquashing[];
 CONTENT_EXPORT extern const char kDisableAcceleratedVideoDecode[];
 CONTENT_EXPORT extern const char kDisableApplicationCache[];
@@ -87,6 +89,8 @@
 CONTENT_EXPORT extern const char kDomAutomationController[];
 CONTENT_EXPORT extern const char kEnableBleedingEdgeRenderingFastPaths[];
 CONTENT_EXPORT extern const char kDisableDeferredFilters[];
+CONTENT_EXPORT extern const char kEnableAcceleratedFixedRootBackground[];
+CONTENT_EXPORT extern const char kEnableAcceleratedOverflowScroll[];
 CONTENT_EXPORT extern const char kEnableLayerSquashing[];
 CONTENT_EXPORT extern const char kEnableContainerCulling[];
 CONTENT_EXPORT extern const char kEnableBeginFrameScheduling[];